Scarifier device for road-grading machines



Feb. 24. 1925.

' J. D. BENBOW ET AL SCARIFIER DEVICE FOR ROAD GRADING MACHINES Filfid Feb. 5. 1923 iii tlti

Piitented Feb. 24, 1925 UNITED STATES PATENT OFFICE.

JAMES D. BENBOW AND HENRY D. HAMPER,

01* ILLINGES.

OF AURORA, ILLINOIS, ASSIGNO ,1 1%

. EBCARIFIEB'DEVICE FOR ROAD-GRADING MACHINES.

Application filed llebruaryfi, 1923. Serial No. 617,116.

To all whom it may concern: c,

Be it known that we, J'Aiins D. Bnnnow and Hnnnr D. HAMPER, citizens of the United States, and residents of Aurora, 1n the county of Kane and State of lllinois. have jointly invented certain new and useful Improvements in dcarifier Devices tor Road-Grading Machines, of which the following is a specification, reference being bad to the accompanying drawin This invention relates to improvements in earth scarifiers designed for attachment to a road grading machine in advance of the scraping blade so as to'loosen the earth in order that the blade may more easily perform its function and thereby enable the machine as a whole to be moved forward with less expenditure of power. it is the object of the invention to rovide a scarifying device that will be simp e in construction and very strong so as to withstand the rough usage to which it is necessarily subjected, and which will have the ointed teeth thereof" that dig into the eart1 very firmly secured against displacement and yet readily removable independently for repointing adjustment or replacement. it 15 also an object of the invention to so con struct the bar that carries such teeth and the parts that connect such bar with the arms that hold the device in suspended vposition that the some means that clamp some of said teeth to the bar will also serve to removably secure the scarifier as a whole to such supporting arms. We accomplish these objects as illustrated in the accompan ing drawing and as partlcularly descrilied hereinafter. That which we believe to be new will be set forth in the claims.

In the drawing,--

Fig. 1 is a view in side elevation of the rear portion of the vertically-ad ustable portion of an ordinary road-scrapin machine that carries the usual scraperla e, and illustratin our improved scerifying device connects therewith;

Fig. 2 is a View in front elevation of the scarifying device of Fig. l; and

Fig. 3 18 an enlar ed vertical section taken at the line 3--3 of Referring to the several figures of the d'rawing,=5 indicates a portion of one of the longitudinall extending beams of a road-grading mec ine which are adapted to end rest in notches 12 in rests a ainst one be raised and lowered by means of links, one of Whichis shown at 6, in order to carry the scraper into and out of operative position. The scraper that extends transversely of'the machine is indicated at 7 and,'as usual, is connected to beams, one of which is shown at 8, these beams beingvfixedly secured to a transverse member such as 9 that is made fast to an ordinary fifth wheel device that is adapted to be turned in the usual manner, whereby the scraper may be set at the desired inclination to the line of travel. All such features as above require no further description.

'lurning now to the scarificr device, in which our present invention is embodied, 10 indicates i1. heavy bar which, as here shown, is an lI-beam, which beam carries a plurality of spaced-apert pointed teeth 11. These teeth extend across the front of the bar 10 the front faces of blocks 13 that fit in the front channel of the l[-beam, as clearly shown in Fig 3. Other blocks 14, each having a notch 15, fit against the front portion of the teeth,-t-he outer surfaces of these last-named blocks being curved to correspond to the curvature of the U-bolts that are employed to clamp the teeth in place, and preferably grooved as indicated to receive such U bolts. The U-bolts referred toe-re indicated by 16 and 17- those indicated by 16 being shorter than the others so that their end portions project just sufficiently far through suitable holes in the web of the bar 10 to permit of the screwing thereon of the retaining nuts indicated by 18. The longer U-bolts 17 after passing through the cenral web of the I-beam 6 pass also through holes in blocks 19 that are fitted to the channel at the rear side of the Lbeam, and one leg of each of such long U- bolts passes through one of two wings 20 that extend in opposite directions laterally from a suspending bar 21; Each wing 20 is best constituted by oneflange of an angle iron, as shown, the other flange of which face of the suspending bar 21 an is secured thereto by one or more rivets 22. In the construction shown there are two of such suspending bars 21, and therefore two of such lon tl-bolts 17 are provided in connection wit each. One of the legs of each of the long U-holts also referred to may be of any ordinary construction, and hence passes through an upturned end 23 of a wide plate 24 that extends below the base of the I-beam 10 and forward therefrom, and with which one of two chains is adapted to be connected for holding the scarifier device as a whole in proper operative position. 25 indicates washers on these bolts against which the nuts on such bolts bear,-said nuts being indicated by 26.

In addition to the securing of the beam 10 to the suspending bars 21 as above described, we provide additional means consisting of bolts 27 each provided with a hook at its forward end. These bolts, as clearly shown in Fig. 1, pass through the wings 20 that extend laterally from each side of each suspending bar 21, the hooks at their forward ends lylng over and engaging the forward flange of the I-beam 10, and nuts 28 that are screwed u thereon against the rear faces of the wings olding such bolts tightly in place. With these hook-bolts lying closely against the upper head of the I-beam, and with the other bolts that pass through the web of such beam, it will be seen that the beam is held very securel to the devices that suspend it in place, an at the same time the arrangement is such that the beam and its attached teeth can be quickly detached from the suspending devices, or any one of the teeth may be detached independently for sharpening, adjustment or replacement.

From the foregoin it will be seen that not only do all of the U-bolts serve as means for clamping the teeth in place, but that the longer ones of such bolts perform the additional function of securing the cross-bar and its attached teeth to the suspending devices, and, furthermore, that one of each pair of such long U-bolts additionally secures in place one of the arms to which the holding chains are' attached.

What we claim as our invention and desire to secure by Letters Patent, 1s-

1. A scarifylng device comprising in combination a beam having a channel in its front face, blocks fitting in said channel and each having a notch in its front face, an earthengaging tooth seated in the notch in each block, suspending means opposite the rear face of the beam comprising a bar having a lateral wing, and U-bolts passing through the beam and lying respectively opposite the sides of said blocks for clamping the said blocks against the beam and clamping thedevice comprising in comlateral wing, and U-bolts passing throu h the beam, each U-bolt embracing one of t 1e pairs of blocks and clamping such blocks and the tooth between them firmly in place, one of said bolts also passing through said wing.

3. A scarifying device comprising in com bination a beam, earth-engaging teeth opposite one face of the beam suspending means opposite the other face of the beam comprising a bar having a lateral wing, an arm extending across the beam and projecting therefrom and having a turned end portion that lies opposite said last-named face of the beam, bolts for clamping said teeth in place. one of said bolts being a U-bolt one leg of which passes through the beam and said lateral wing and the other leg of which passes through the beam and the said turned end of the arm.

JAMES D. BENBOW. HENRY D. HAMPER. 

